Nanoindentation studies of metallic glasses and nanoquasicrystal-glass composites in Zr-Al (Ga)-Cu-Ni alloys

Abstract

In this presentation, we report the indentation behavior of Zr 69.5Al7.5-xGaxCu12Ni11 (x = 0 and 1.5 at.%) metallic glasses as well as nanoquasicrystalglass composites. The minor alloying addition in Zr-based glassy alloys greatly influences their mechanical properties. The nanoindentation tests were carried out to study the load (P) versus displacement (h) curves for the determination of reduced modulus as well as their hardness behavior. The formation of shear bands around the indentation periphery has been investigated. The evidence of the pile up was observed. The P - h curve for as-synthesized melt-spun ribbons displayed the presence of displacement burst, which are known as pop-ins. It has been concluded that Ga substitution leads to the improvement of the mechanical behavior of ZrAl (Ga)CuNi alloys. © 2011 World Scientific Publishing Company.